90449881 has 4 divisors (see below), whose sum is σ = 91382452. Its totient is φ = 89517312.

The previous prime is 90449873. The next prime is 90449903. The reversal of 90449881 is 18894409.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 53056656 + 37393225 = 7284^2 + 6115^2 .

It is a cyclic number.

It is not a de Polignac number, because 90449881 - 2³ = 90449873 is a prime.

It is a super-2 number, since 2×90449881² = 16362361945828322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90449851) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 466140 + ... + 466333.

It is an arithmetic number, because the mean of its divisors is an integer number (22845613).

Almost surely, 2^90449881 is an apocalyptic number.

It is an amenable number.

90449881 is a deficient number, since it is larger than the sum of its proper divisors (932571).

90449881 is an equidigital number, since it uses as much as digits as its factorization.

90449881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 932570.

The product of its (nonzero) digits is 82944, while the sum is 43.

The square root of 90449881 is about 9510.5142342567. The cubic root of 90449881 is about 448.8859372003.

The spelling of 90449881 in words is "ninety million, four hundred forty-nine thousand, eight hundred eighty-one".